Avoid potential command injections

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Metadata

ID: php-security/command-injection

Language: PHP

Severity: Error

Category: Security

CWE: 78

Description

Command injection vulnerabilities occur when an application passes unsafe user supplied data (forms, cookies, HTTP headers etc.) to a system shell. In this case, the attacker could execute arbitrary commands on the host operating system.

A command injection vulnerability could lead to data loss, corruption, or unauthorized access to sensitive data.

Always sanitize and validate user input before using it in a system command and avoid directly incorporating user input into system commands where possible.

Non-Compliant Code Examples

<?php
function check($host, $dir) {
    system("ping -n 3 " . $host);
    $out = null;
    $ret = null;
    exec('ls -lah'.$dir, $out, $ret);
}

Compliant Code Examples

<?php
function check() {
    system("ping -n 3 domain");
    $out = null;
    $ret = null;
    exec('ls -lah dir', $out, $ret);
}